That left them locked in the shop with no-one to let them out.
27-year-old Sarah Sinclair and her boyfriend’s brother 25-year-old Luke Miller only popped out to get bread and milk before closing time on December 27.
Whilst they were wandering the aisles of the shop the staff must have finished up their shifts and left, leaving the pair inside an empty supermarket.
The pair then had to called 101 in order to escape, eventually getting out of the German supermarket chain's Redcar branch via the fire exit.
In the end it was hardly a great ordeal for them, as they were only trapped inside the shop for around 30 minutes.
Sarah explained: "When we first arrived there were people in there and staff at the checkouts.
"We were just wandering around shopping and didn't pay attention until we went to pay and I started to think 'where's the staff'?
"Then we noticed a beeping but at the time, I just wanted my bread and milk so I hadn't thought anything of it - I had barely even noticed the sound.
"We started looking around - I turned to Luke and he said 'oh no'.
"We couldn't believe it and I was laughing so hard I thought I'd pee until I started thinking 'but what do we actually do?'.”
She continued: "When all the doors were locked I started thinking I'd have to open a drink off the shelf.
"But I also thought about how there would probably be a bed among the stuff in the middle aisle so we'd be ok!
"Eventually Luke called 101 and the police told us to try the fire doors - we ended up having to go into the stock room at the back to find one that opened, and finally we got out.
"The manager called Luke into the store in the following days and gave him a bunch of flowers and a crate of lager as an apology.
"At the time we had no idea what would happen but looking back we just find it funny."
"I have no idea how it happened and how nobody saw us in there because we weren't hiding - but we got out in the end!"
Well, that’s the main thing.
Everyone got out safe, and Luke got a crate of lager.
All’s well that ends well.Featured Image Credit: SWNS